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  <ul>
    <li><a href="#一textfield-实现各种各样的输入框">一、TextField 实现各种各样的输入框</a>
      <ul>
        <li><a href="#1普通表单">1、普通表单</a></li>
        <li><a href="#2边框表单label-动效">2、边框表单、label 动效</a></li>
        <li><a href="#3多行表单">3、多行表单</a></li>
        <li><a href="#4密码框">4、密码框</a></li>
        <li><a href="#5icon-表单">5、icon 表单</a></li>
      </ul>
    </li>
    <li><a href="#二textfield-获取表单值和设置初始值">二、TextField 获取表单值和设置初始值</a>
      <ul>
        <li><a href="#1设置初始值">1、设置初始值</a></li>
        <li><a href="#2获取表单值并同步渲染到页面">2、获取表单值，并同步渲染到页面</a></li>
        <li><a href="#3完整-textfield-设置和控制代码">3、完整 TextField 设置和控制代码</a></li>
        <li><a href="#heading"></a></li>
      </ul>
    </li>
    <li><a href="#三完整代码示例">三、完整代码示例</a>
      <ul>
        <li><a href="#2设置表单初始值和获取表单值">2、设置表单初始值和获取表单值</a></li>
      </ul>
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    <article class="post">
        <header>
            <h1 class="post-title">Flutter_TextField样式控制及输入框取值</h1>
        </header>
        <date class="post-meta meta-date">
            2021年9月1日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Flutter'>Flutter</a></span>
            
            <span class="meta-category"><a href='/categories/dart'>dart</a></span>
            
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                    阅读</span></span>
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            <h2 id="一textfield-实现各种各样的输入框">一、TextField 实现各种各样的输入框</h2>
<p><code>TextField</code> 是一个非常简单的表单输入框 Widget，基于 <code>EditableText</code> Widget 实现</p>
<p>支持的属性非常多：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">  <span style="color:#66d9ef">const</span> TextField({
    Key key,
    <span style="color:#66d9ef">this</span>.controller,
    <span style="color:#66d9ef">this</span>.focusNode,
    <span style="color:#66d9ef">this</span>.decoration <span style="color:#f92672">=</span> <span style="color:#66d9ef">const</span> InputDecoration(),
    TextInputType keyboardType,
    <span style="color:#66d9ef">this</span>.textInputAction,
    <span style="color:#66d9ef">this</span>.textCapitalization <span style="color:#f92672">=</span> TextCapitalization.none,
    <span style="color:#66d9ef">this</span>.style,
    <span style="color:#66d9ef">this</span>.strutStyle,
    <span style="color:#66d9ef">this</span>.textAlign <span style="color:#f92672">=</span> TextAlign.start,
    <span style="color:#66d9ef">this</span>.textAlignVertical,
    <span style="color:#66d9ef">this</span>.textDirection,
    <span style="color:#66d9ef">this</span>.readOnly <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>,
    <span style="color:#66d9ef">this</span>.showCursor,
    <span style="color:#66d9ef">this</span>.autofocus <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>,
    <span style="color:#66d9ef">this</span>.obscureText <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>,
    <span style="color:#66d9ef">this</span>.autocorrect <span style="color:#f92672">=</span> <span style="color:#66d9ef">true</span>,
    <span style="color:#66d9ef">this</span>.maxLines <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>,
    <span style="color:#66d9ef">this</span>.minLines,
    <span style="color:#66d9ef">this</span>.expands <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>,
    <span style="color:#66d9ef">this</span>.maxLength,
    <span style="color:#66d9ef">this</span>.maxLengthEnforced <span style="color:#f92672">=</span> <span style="color:#66d9ef">true</span>,
    <span style="color:#66d9ef">this</span>.onChanged,
    <span style="color:#66d9ef">this</span>.onEditingComplete,
    <span style="color:#66d9ef">this</span>.onSubmitted,
    <span style="color:#66d9ef">this</span>.inputFormatters,
    <span style="color:#66d9ef">this</span>.enabled,
    <span style="color:#66d9ef">this</span>.cursorWidth <span style="color:#f92672">=</span> <span style="color:#ae81ff">2.0</span>,
    <span style="color:#66d9ef">this</span>.cursorRadius,
    <span style="color:#66d9ef">this</span>.cursorColor,
    <span style="color:#66d9ef">this</span>.keyboardAppearance,
    <span style="color:#66d9ef">this</span>.scrollPadding <span style="color:#f92672">=</span> <span style="color:#66d9ef">const</span> EdgeInsets.all(<span style="color:#ae81ff">20.0</span>),
    <span style="color:#66d9ef">this</span>.dragStartBehavior <span style="color:#f92672">=</span> DragStartBehavior.start,
    <span style="color:#66d9ef">this</span>.enableInteractiveSelection,
    <span style="color:#66d9ef">this</span>.onTap,
    <span style="color:#66d9ef">this</span>.buildCounter,
    <span style="color:#66d9ef">this</span>.scrollController,
    <span style="color:#66d9ef">this</span>.scrollPhysics,
  })
</code></pre></div><p>支持单行和多行的文件输入及表单值的获取</p>
<h3 id="1普通表单">1、普通表单</h3>
<p>直接通过 <code>TextField</code> 可以显示一个最简单的表单：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">TextField()
</code></pre></div><p>效果:</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/748450152.png">
            <img class="mx-auto" alt="86566-69wwqzrcgac.png" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/748450152.png" />
        </a>
    </p>
<h3 id="2边框表单label-动效">2、边框表单、label 动效</h3>
<p>如果是 Material Design 的 UI 设计风格，我们经常会看到边框的表单，点击之后，一个 placeholder 浮动到上面去</p>
<p>在 TextField 中通过配置 <code>decoration</code> 属性，传入一个 <code>InputeDecoration</code> Widget 来配置具体的显示内容， <code>InputeDecoration</code> 支持的属性也非常的多，这里就不举出了。</p>
<p><code>labelText</code> 是可以浮动的提示文案，而 placeholder 其实是通过 <code>hintText</code> 指定的</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">TextField(
  decoration: InputDecoration(
    labelText: <span style="color:#e6db74">&#39;表单label&#39;</span>,
    labelStyle: TextStyle(
      color: Colors.pink,
      fontSize: <span style="color:#ae81ff">12</span>,
    ),
    helperText: <span style="color:#e6db74">&#39;helperText&#39;</span>,
    hintText: <span style="color:#e6db74">&#39;Placeholder...&#39;</span>,
    border: OutlineInputBorder(
      borderSide: BorderSide(
        color: Colors.pink,
      ),
    ),
  ),
)
</code></pre></div><p>效果：</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/3843257758.gif">
            <img class="mx-auto" alt="1.gif" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/3843257758.gif" />
        </a>
    </p>
<p>上面我并没有配置 focus 状态的外边框的颜色，如果要指定，则可以通过 <code>focusedBorder</code> 指定：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">focusedBorder: OutlineInputBorder(
  borderSide: BorderSide(
    color: Colors.pink,
  ),
)
</code></pre></div><p>效果：</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/1627572783.png">
            <img class="mx-auto" alt="47596-2oicvevt4mu.png" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/1627572783.png" />
        </a>
    </p>
<h3 id="3多行表单">3、多行表单</h3>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">TextField(
  maxLines: <span style="color:#ae81ff">4</span>,
  decoration: InputDecoration(hintText: <span style="color:#e6db74">&#39;多行文本&#39;</span>),
),
</code></pre></div><p>效果：</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/4021439431.png">
            <img class="mx-auto" alt="98720-rn1s8g8y1te.png" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/4021439431.png" />
        </a>
    </p>
<h3 id="4密码框">4、密码框</h3>
<p>如果要使一个表单变成密码框，只需配置 <code>obscureText</code> 属性是 true</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">TextField(
  obscureText: <span style="color:#66d9ef">true</span>,
  decoration: InputDecoration(hintText: <span style="color:#e6db74">&#39;密码框&#39;</span>),
),
</code></pre></div><p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/2480513225.png">
            <img class="mx-auto" alt="75931-ea4l8x06cmr.png" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/2480513225.png" />
        </a>
    </p>
<h3 id="5icon-表单">5、icon 表单</h3>
<p><code>InputDecoration</code> 支持传入一个 icon 属性，传入之后，会在表单的前面显示一个 icon</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">TextField(
  obscureText: <span style="color:#66d9ef">true</span>,
  decoration: InputDecoration(
    hintText: <span style="color:#e6db74">&#39;图标&#39;</span>,
    icon: Icon(Icons.palette),
  ),
</code></pre></div><p>效果：</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/678827543.png">
            <img class="mx-auto" alt="77645-2b2ox8rpdxb.png" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/678827543.png" />
        </a>
    </p>
<h2 id="二textfield-获取表单值和设置初始值">二、TextField 获取表单值和设置初始值</h2>
<p>如果要获取表单值和设置初始值，首先我们会使用一个 StatefulWidget，然后会监听 TextField 的 <code>onChanged</code> 事件，每次存取值。</p>
<p>这个逻辑在现代 Web 框架中已经很成熟了，但是初始值的设置以及表单值得绑定则不太一样。</p>
<p>TextField 接收一个 <code>controller</code> 属性，类型是 <code>TextEditingController</code>，从注释中可以看出，我们可以通过 <code>controller</code> 从外部控制表单的一切</p>
<p>类似于 Web 中拿到表单实例，然后在去控制表单一样</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">  <span style="color:#75715e">/// Controls the text being edited.
</span><span style="color:#75715e"></span>  <span style="color:#75715e">///
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// If null, this widget will create its own [TextEditingController].
</span><span style="color:#75715e"></span>  <span style="color:#66d9ef">final</span> TextEditingController controller;
</code></pre></div><h3 id="1设置初始值">1、设置初始值</h3>
<p>首先我们需要定义一个 TextEditingController：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">  TextEditingController _name <span style="color:#f92672">=</span> TextEditingController();
</code></pre></div><p>在 initState 的时候，设置初始值：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> initState() {
    <span style="color:#66d9ef">super</span>.initState();
    <span style="color:#66d9ef">this</span>._name.text <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;ptbird&#39;</span>; <span style="color:#75715e">// 设置初始值
</span><span style="color:#75715e"></span>  }
</code></pre></div><p>将 <code>_name</code> 传入给 <code>TextField</code> 组件：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">TextField(
  decoration: InputDecoration(
    hintText: <span style="color:#e6db74">&#39;账户&#39;</span>,
    hintStyle: TextStyle(
      fontSize: <span style="color:#ae81ff">12</span>,
      color: Colors.grey[<span style="color:#ae81ff">300</span>],
    ),
  ),
  controller: <span style="color:#66d9ef">this</span>._name,
  onChanged: (value) {
    <span style="color:#66d9ef">this</span>.setState(() {
      <span style="color:#66d9ef">this</span>._name.text <span style="color:#f92672">=</span> value;
    });
  },
)
</code></pre></div><p>先不关心 <code>onChanged</code> 的事件处理，效果如下：</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/3936572271.png">
            <img class="mx-auto" alt="65110-b07u0ac3w4n.png" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/3936572271.png" />
        </a>
    </p>
<h3 id="2获取表单值并同步渲染到页面">2、获取表单值，并同步渲染到页面</h3>
<p>因为没有双向绑定，和 React 处理思想类似，都是手动 setState</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">  onChanged: (value) {
    <span style="color:#66d9ef">this</span>.setState(() {
      <span style="color:#66d9ef">this</span>._pass.text <span style="color:#f92672">=</span> value;
    });
  },
</code></pre></div><p>在 Container 中渲染两个值：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">          Container(
            width: <span style="color:#66d9ef">double</span>.infinity,
            child: Text(<span style="color:#e6db74">&#39;</span><span style="color:#e6db74">${</span><span style="color:#66d9ef">this</span>._name.text<span style="color:#e6db74">}</span><span style="color:#e6db74"> - </span><span style="color:#e6db74">${</span><span style="color:#66d9ef">this</span>._pass.text<span style="color:#e6db74">}</span><span style="color:#e6db74">&#39;</span>),
          ),
</code></pre></div><p>最终效果：</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/image/4089725768.gif">
            <img class="mx-auto" alt="2.gif" src="https://luckly007.oss-cn-beijing.aliyuncs.com/image/4089725768.gif" />
        </a>
    </p>
<h3 id="3完整-textfield-设置和控制代码">3、完整 TextField 设置和控制代码</h3>
<h3 id="heading"></h3>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_TextFieldDemoState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>TextFieldDemo<span style="color:#f92672">&gt;</span> {
  TextEditingController _name <span style="color:#f92672">=</span> TextEditingController();
  TextEditingController _pass <span style="color:#f92672">=</span> TextEditingController();

  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> initState() {
    <span style="color:#66d9ef">super</span>.initState();
    <span style="color:#66d9ef">this</span>._name.text <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;ptbird&#39;</span>; <span style="color:#75715e">// 设置初始值
</span><span style="color:#75715e"></span>  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Padding(
      padding: EdgeInsets.all(<span style="color:#ae81ff">10</span>),
      child: Column(
        children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
          TextField(
            decoration: InputDecoration(
              hintText: <span style="color:#e6db74">&#39;账户&#39;</span>,
              hintStyle: TextStyle(
                fontSize: <span style="color:#ae81ff">12</span>,
                color: Colors.grey[<span style="color:#ae81ff">300</span>],
              ),
            ),
            controller: <span style="color:#66d9ef">this</span>._name,
            onChanged: (value) {
              <span style="color:#66d9ef">this</span>.setState(() {
                <span style="color:#66d9ef">this</span>._name.text <span style="color:#f92672">=</span> value;
              });
            },
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          TextField(
            obscureText: <span style="color:#66d9ef">true</span>,
            decoration: InputDecoration(
              hintText: <span style="color:#e6db74">&#39;密码&#39;</span>,
              hintStyle: TextStyle(
                fontSize: <span style="color:#ae81ff">12</span>,
                color: Colors.grey[<span style="color:#ae81ff">300</span>],
              ),
            ),
            controller: <span style="color:#66d9ef">this</span>._pass,
            onChanged: (value) {
              <span style="color:#66d9ef">this</span>.setState(() {
                <span style="color:#66d9ef">this</span>._pass.text <span style="color:#f92672">=</span> value;
              });
            },
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          Container(
            width: <span style="color:#66d9ef">double</span>.infinity,
            height: <span style="color:#ae81ff">40</span>,
            child: RaisedButton(
              child: Text(<span style="color:#e6db74">&#39;Login&#39;</span>),
              onPressed: () {
                print(<span style="color:#66d9ef">this</span>._name);
                print(<span style="color:#66d9ef">this</span>._pass);
              },
            ),
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          Container(
            width: <span style="color:#66d9ef">double</span>.infinity,
            child: Text(<span style="color:#e6db74">&#39;</span><span style="color:#e6db74">${</span><span style="color:#66d9ef">this</span>._name.text<span style="color:#e6db74">}</span><span style="color:#e6db74"> - </span><span style="color:#e6db74">${</span><span style="color:#66d9ef">this</span>._pass.text<span style="color:#e6db74">}</span><span style="color:#e6db74">&#39;</span>),
          ),
        ],
      ),
    );
  }
}
</code></pre></div><h2 id="三完整代码示例">三、完整代码示例</h2>
<p>1、TextField 各种样式</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#75715e">// import &#39;mock/list.dart&#39; as newsList;
</span><span style="color:#75715e"></span>
<span style="color:#66d9ef">const</span> TITLE <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;标题标题标题标题标题标题标题&#39;</span>;
<span style="color:#66d9ef">const</span> SUB_TITLE <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;二级标题二级标题二级标题二级标题二级标题二级标题二级标题二级标题二&#39;</span>;
<span style="color:#66d9ef">const</span> IMAGE_SRC <span style="color:#f92672">=</span>
    <span style="color:#e6db74">&#39;http://imgcdn.ph.126.net/UQhSl0NAkp9wsn0keF-rLA==/3084402794814350820.jpg&#39;</span>;
<span style="color:#66d9ef">const</span> IMAGE_SRC_2 <span style="color:#f92672">=</span>
    <span style="color:#e6db74">&#39;http://imglf.nosdn.127.net/img/NVc1cHVseFhyWFcwdHhpdjJydFRvcWJSa0NNbGlRbGN2TXNOS3NwQVdET042YmpmemdjUm5RPT0.jpg&#39;</span>;

<span style="color:#66d9ef">void</span> main() {
  runApp(MyApp());
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyApp</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  MyApp({Key key}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(key: key);

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text(<span style="color:#e6db74">&#39;表单&#39;</span>),
          backgroundColor: Colors.pink,
        ),
        body: HomeContent(),
      ),
    );
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">HomeContent</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  <span style="color:#66d9ef">const</span> HomeContent({Key key}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(key: key);

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> TextFieldDemo();
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">TextFieldDemo</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
  TextFieldDemo({Key key}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(key: key);

  _TextFieldDemoState createState() <span style="color:#f92672">=&gt;</span> _TextFieldDemoState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_TextFieldDemoState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>TextFieldDemo<span style="color:#f92672">&gt;</span> {
  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Padding(
      padding: EdgeInsets.all(<span style="color:#ae81ff">10</span>),
      child: Column(
        children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
          TextField(),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          TextField(
            decoration: InputDecoration(
              labelText: <span style="color:#e6db74">&#39;表单label&#39;</span>,
              labelStyle: TextStyle(
                color: Colors.pink,
                fontSize: <span style="color:#ae81ff">12</span>,
              ),
              helperText: <span style="color:#e6db74">&#39;helperText&#39;</span>,
              hintText: <span style="color:#e6db74">&#39;Placeholder...&#39;</span>,
              border: OutlineInputBorder(
                borderSide: BorderSide(
                  color: Colors.pink,
                ),
              ),
            ),
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          TextField(
            maxLines: <span style="color:#ae81ff">4</span>,
            decoration: InputDecoration(hintText: <span style="color:#e6db74">&#39;多行文本&#39;</span>),
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          TextField(
            obscureText: <span style="color:#66d9ef">true</span>,
            decoration: InputDecoration(hintText: <span style="color:#e6db74">&#39;密码框&#39;</span>),
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          TextField(
            obscureText: <span style="color:#66d9ef">true</span>,
            decoration:
                InputDecoration(hintText: <span style="color:#e6db74">&#39;图标&#39;</span>, icon: Icon(Icons.palette)),
          ),
        ],
      ),
    );
  }
}
</code></pre></div><h3 id="2设置表单初始值和获取表单值">2、设置表单初始值和获取表单值</h3>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#75715e">// import &#39;mock/list.dart&#39; as newsList;
</span><span style="color:#75715e"></span>
<span style="color:#66d9ef">const</span> TITLE <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;标题标题标题标题标题标题标题&#39;</span>;
<span style="color:#66d9ef">const</span> SUB_TITLE <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;二级标题二级标题二级标题二级标题二级标题二级标题二级标题二级标题二&#39;</span>;
<span style="color:#66d9ef">const</span> IMAGE_SRC <span style="color:#f92672">=</span>
    <span style="color:#e6db74">&#39;http://imgcdn.ph.126.net/UQhSl0NAkp9wsn0keF-rLA==/3084402794814350820.jpg&#39;</span>;
<span style="color:#66d9ef">const</span> IMAGE_SRC_2 <span style="color:#f92672">=</span>
    <span style="color:#e6db74">&#39;http://imglf.nosdn.127.net/img/NVc1cHVseFhyWFcwdHhpdjJydFRvcWJSa0NNbGlRbGN2TXNOS3NwQVdET042YmpmemdjUm5RPT0.jpg&#39;</span>;

<span style="color:#66d9ef">void</span> main() {
  runApp(MyApp());
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyApp</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  MyApp({Key key}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(key: key);

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text(<span style="color:#e6db74">&#39;表单取值设置值&#39;</span>),
          backgroundColor: Colors.pink,
        ),
        body: HomeContent(),
      ),
    );
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">HomeContent</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  <span style="color:#66d9ef">const</span> HomeContent({Key key}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(key: key);

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> TextFieldDemo();
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">TextFieldDemo</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
  TextFieldDemo({Key key}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(key: key);

  _TextFieldDemoState createState() <span style="color:#f92672">=&gt;</span> _TextFieldDemoState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_TextFieldDemoState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>TextFieldDemo<span style="color:#f92672">&gt;</span> {
  TextEditingController _name <span style="color:#f92672">=</span> TextEditingController();
  TextEditingController _pass <span style="color:#f92672">=</span> TextEditingController();

  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> initState() {
    <span style="color:#66d9ef">super</span>.initState();
    <span style="color:#66d9ef">this</span>._name.text <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;ptbird&#39;</span>; <span style="color:#75715e">// 设置初始值
</span><span style="color:#75715e"></span>  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Padding(
      padding: EdgeInsets.all(<span style="color:#ae81ff">10</span>),
      child: Column(
        children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
          TextField(
            decoration: InputDecoration(
              hintText: <span style="color:#e6db74">&#39;账户&#39;</span>,
              hintStyle: TextStyle(
                fontSize: <span style="color:#ae81ff">12</span>,
                color: Colors.grey[<span style="color:#ae81ff">300</span>],
              ),
            ),
            controller: <span style="color:#66d9ef">this</span>._name,
            onChanged: (value) {
              <span style="color:#66d9ef">this</span>.setState(() {
                <span style="color:#66d9ef">this</span>._name.text <span style="color:#f92672">=</span> value;
              });
            },
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          TextField(
            obscureText: <span style="color:#66d9ef">true</span>,
            decoration: InputDecoration(
              hintText: <span style="color:#e6db74">&#39;密码&#39;</span>,
              hintStyle: TextStyle(
                fontSize: <span style="color:#ae81ff">12</span>,
                color: Colors.grey[<span style="color:#ae81ff">300</span>],
              ),
            ),
            controller: <span style="color:#66d9ef">this</span>._pass,
            onChanged: (value) {
              <span style="color:#66d9ef">this</span>.setState(() {
                <span style="color:#66d9ef">this</span>._pass.text <span style="color:#f92672">=</span> value;
              });
            },
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          Container(
            width: <span style="color:#66d9ef">double</span>.infinity,
            height: <span style="color:#ae81ff">40</span>,
            child: RaisedButton(
              child: Text(<span style="color:#e6db74">&#39;Login&#39;</span>),
              onPressed: () {
                print(<span style="color:#66d9ef">this</span>._name);
                print(<span style="color:#66d9ef">this</span>._pass);
              },
            ),
          ),
          SizedBox(height: <span style="color:#ae81ff">10</span>),
          Container(
            width: <span style="color:#66d9ef">double</span>.infinity,
            child: Text(<span style="color:#e6db74">&#39;</span><span style="color:#e6db74">${</span><span style="color:#66d9ef">this</span>._name.text<span style="color:#e6db74">}</span><span style="color:#e6db74"> - </span><span style="color:#e6db74">${</span><span style="color:#66d9ef">this</span>._pass.text<span style="color:#e6db74">}</span><span style="color:#e6db74">&#39;</span>),
          ),
        ],
      ),
    );
  }
}
</code></pre></div>
        </div>

        
<div class="post-archive">
    <ul class="post-copyright">
        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/flutter_widget/Flutter_TextField%E6%A0%B7%E5%BC%8F%E6%8E%A7%E5%88%B6%E5%8F%8A%E8%BE%93%E5%85%A5%E6%A1%86%E5%8F%96%E5%80%BC/">https://luckly.work/post/flutter_widget/Flutter_TextField%E6%A0%B7%E5%BC%8F%E6%8E%A7%E5%88%B6%E5%8F%8A%E8%BE%93%E5%85%A5%E6%A1%86%E5%8F%96%E5%80%BC/</a></li>
        <li><strong>版权声明：</strong>本作品采用<a rel="license" href="https://creativecommons.org/licenses/by-nc-nd/4.0/">知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议</a>进行许可，非商业转载请注明出处（作者，原文链接），商业转载请联系作者获得授权。</li>
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<div class="post-archive">
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    </ul>
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